Chrome: If you're a designer or just curious to see what fonts are used on your favorite web sites, the free Chrome extension ‘What's the font?' reveals this information easily. After installing the extension you just need to right-click the highlighted text with the font you want to identify and choose the menu option for ‘What's the font?'.

Of course you can delve into the page's source code and find that information yourself without the extension, but that takes more time and can be confusing if the page uses many fonts. The big drawback to this extension for me is that it can't identify fonts in images. We covered a similar-sounding webapps What the Font?! and What Font years ago that can find fonts in image files, but going to a webapp and uploading a file isn't quite as convenient as a browser extension where you only need to highlight text.